1 files changed, 9 insertions, 0 deletions
diff --git a/tests/template_backends/test_utils.py b/tests/template_backends/test_utils.py
index 3d2de99015..c3eb6577a0 100644
--- a/tests/template_backends/test_utils.py
+++ b/tests/template_backends/test_utils.py
@@ -35,3 +35,12 @@ class TemplateStringsTests(SimpleTestCase):
             engines.all()
         with self.assertRaises(ImproperlyConfigured):
             engines.all()
+
+    @override_settings(TEMPLATES=[{
+        'BACKEND': 'django.template.backends.django.DjangoTemplates',
+    }, {
+        'BACKEND': 'django.template.backends.django.DjangoTemplates',
+    }])
+    def test_backend_names_must_be_unique(self):
+        with self.assertRaises(ImproperlyConfigured):
+            engines.all()